Question

what A is the size of the vibrations​

Answer 1

Explanation:

Amplitude of vibrations and loudness

The size of a vibration or its amplitude is a measure of how far the object moves outwards from the starting position. An object vibrating with a large amplitude requires a large amount of energy and produces a loud sound.

Answer 2

Answer:

Vibration, periodic back-and-forth motion of the particles of an elastic body or medium, commonly resulting when almost any physical system is displaced from its equilibrium condition and allowed to respond to the forces that tend to restore equilibrium.